What does me seeing a orb mean?

A few weeks ago when I was going into my room(my room lights were of and the hallway one was too so it was pretty dark) I opened the door and there was a soccer ball sized orb just in front of my door inside my room and it stayed there for a second or two and then went into the ceiling. The orb was greenish blue but more on the green side. Any help on what it meant is appreciated.



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